| 摘要 |
A cardiac lead has an end adapted for contact with cardiac tissue that has a number of dot-like electrodes which are separated from each other by electrically insulating material, and which are positioned at respective locations adapted for simultaneous contact with the cardiac tissue. The dot-like electrodes produce respective unipolar signals. At least one difference signal from the unipolar signals of a pair of the dot-like electrodes. The difference signal is edited in circuitry of a cardiac assist device and is compared to a threshold. If the threshold is exceeded, a signal indicating a cardiac rhythm abnormality, such as fibrillation, is generated for triggering electrical therapy delivered to the cardiac tissue by the cardiac assist device. <IMAGE>
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